Khi cho kim loại tác dụng với dung dịch HCl, H2SO4 loãng có chất khí thoát ra. Chất khí đó là chất khí nào? A. khí oxi. B. khí hiđro. C. khí lưu hùynh đioxit . D. Khí clo

Which buffer would be better able to hold a steady ph on the addition of strong acid, buffer 1 or buffer 2? explain. buffer 1: a solution containing 0.10 m nh4cl and 1 m nh3. buffer 2: a solution containing 1 m nh4cl and 0.10 m nh3

Why does asexual reproduction result in offspring with identicle genetic variation

Which statement is true regarding the diagram of circle p? the sum of y and z must be 2x. the sum of y and z must be x. the difference of z and y must be 2x. the difference of z and y must be x